package ngames.com.sushitv.tools;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

import java.util.Random;

/**
 * Created by Jeffrey on 2016/8/4.
 */
public class Code {
    //随机数数组
    private static final char[] CHARS = {
            '2', '3', '4', '5', '6', '7', '8', '9',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm',
            'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
            'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
    };

    private static Code bmpCode;

    public static Code getInstance() {
        if (bmpCode == null)
            bmpCode = new Code(new Builder());
        return bmpCode;
    }

    //default settings

    //settings decided by the layout xml
    //canvas width and height
    private int width, height;

    //random word space and pading_top
    private int base_padding_left, range_padding_left,
            base_padding_top, range_padding_top;

    //number of chars, lines; font size
    private int codeLength, line_number, font_size;

    //variables
    private String code;
    private int padding_left, padding_top;
    private Random random = new Random();

    private Code(Builder builder) {
        codeLength = builder.codeLength;
        line_number = builder.line_number;
        font_size = builder.font_size;
        width = builder.width;
        height = builder.height;
        base_padding_left = builder.base_padding_left;
        range_padding_left = builder.range_padding_left;
        base_padding_top = builder.base_padding_top;
        range_padding_top = builder.range_padding_top;
    }

    //验证码图片
    public Bitmap createBitmap() {
        padding_left = 0;

        Bitmap bp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(bp);

        code = createCode();

        c.drawColor(Color.WHITE);
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setTextSize(font_size);
        //画验证码
        for (int i = 0; i < code.length(); i++) {
            randomTextStyle(paint);
            randomPadding();
            c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
        }
        //画线条
        for (int i = 0; i < line_number; i++) {
            drawLine(c, paint);
        }

        c.save(Canvas.ALL_SAVE_FLAG);//保存
        c.restore();//
        return bp;
    }

    public String getCode() {
        return code;
    }

    //生成验证码
    private String createCode() {
        StringBuilder buffer = new StringBuilder();
        for (int i = 0; i < codeLength; i++) {
            buffer.append(CHARS[random.nextInt(CHARS.length)]);
        }
        return buffer.toString();
    }

    //画干扰线
    private void drawLine(Canvas canvas, Paint paint) {
        int color = randomColor();
        int startX = random.nextInt(width);
        int startY = random.nextInt(height);
        int stopX = random.nextInt(width);
        int stopY = random.nextInt(height);
        paint.setStrokeWidth(1);
        paint.setColor(color);
        canvas.drawLine(startX, startY, stopX, stopY, paint);
    }

    //生成随机颜色
    private int randomColor() {
        return randomColor(1);
    }

    private int randomColor(int rate) {
        int red = random.nextInt(256) / rate;
        int green = random.nextInt(256) / rate;
        int blue = random.nextInt(256) / rate;
        return Color.rgb(red, green, blue);
    }

    //随机生成文字样式，颜色，粗细，倾斜度
    private void randomTextStyle(Paint paint) {
        int color = randomColor();
        paint.setColor(color);
        paint.setFakeBoldText(random.nextBoolean());  //true为粗体，false为非粗体
        float skewX = random.nextInt(11) / 10;
        skewX = random.nextBoolean() ? skewX : -skewX;
        paint.setTextSkewX(skewX); //float类型参数，负数表示右斜，整数左斜
        //paint.setUnderlineText(true); //true为下划线，false为非下划线
        //paint.setStrikeThruText(true); //true为删除线，false为非删除线
    }

    //随机生成padding值
    private void randomPadding() {
        padding_left += base_padding_left + random.nextInt(range_padding_left);
        padding_top = base_padding_top + random.nextInt(range_padding_top);
    }

    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    public static int sp2px(Context context, float spValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (spValue * scale + 0.5f);
    }

    public static class Builder {
        //验证码默认随机数的个数
        private static final int DEFAULT_CODE_LENGTH = 4;
        //默认字体大小
        private static final int DEFAULT_FONT_SIZE = 25;
        //默认线条的条数
        private static final int DEFAULT_LINE_NUMBER = 5;

        //验证码的默认宽高
        private static final int DEFAULT_WIDTH = 100, DEFAULT_HEIGHT = 40;

        //padding值
        private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;

        private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;

        //settings decided by the layout xml
        //canvas width and height
        private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;

        //random word space and pading_top
        private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT,
                base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;

        public Code build() {
            return new Code(this);
        }

        public Builder setCodeLength(int length) {
            codeLength = length;
            return this;
        }

        public Builder setLineNumber(int number) {
            line_number = number;
            return this;
        }

        public Builder setFontSize(int size) {
            font_size = size;
            return this;
        }

        public Builder setFontSize(Context context, int size) {
            font_size = sp2px(context, size);
            return this;
        }

        public Builder setWidth(Context context, int width) {
            this.width = dip2px(context, width);
            return this;
        }

        public Builder setHeight(Context context, int height) {
            this.height = dip2px(context, height);
            return this;
        }

        public Builder setPaddingLeft(Context context, int base_padding_left, int range_padding_left) {
            this.base_padding_left = dip2px(context, base_padding_left);
            this.range_padding_left = dip2px(context, range_padding_left);
            return this;
        }

        public Builder setPaddingTop(Context context, int base_padding_top, int range_padding_top) {
            this.base_padding_top = dip2px(context, base_padding_top);
            this.range_padding_top = dip2px(context, range_padding_top);
            return this;
        }
    }
}
